[Issue 21122] New: hasUDAs/getUDAs/getSymbolsByUDA fails on local symbol UDAs with enum values

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21122

          Issue ID: 21122
           Summary: hasUDAs/getUDAs/getSymbolsByUDA fails on local symbol
                    UDAs with enum values
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: zan77137 at nifty.com

This code doesn't work:
--------------------------------------
import std.traits;
enum B;
void main()
{
    enum A;
    struct S { @A int a; }
    enum E { @A a, @B b }

    static assert(hasUDA!(S.a, A));
    // Error: undefined identifier A ... while evaluating:
    static assert(hasUDA!(E.a, A));
    static assert(hasUDA!(E.b, B));

    static assert(is(getUDAs!(S.a, A)[0] : A));
    // Error: static assert:  is(getUDAs!(cast(E)0, A)[0] : A) is false
    static assert(is(getUDAs!(E.a, A)[0] : A));
    static assert(is(getUDAs!(E.b, B)[0] : B));

    static assert(getSymbolsByUDA!(S, A).length == 1);
    // Error: static assert:  0LU == 1LU is false
    //static assert(getSymbolsByUDA!(E, A).length == 1);
    static assert(getSymbolsByUDA!(E, B).length == 1);
}
--------------------------------------

The following issue is similar, but the previous example succeeds in S, but
fails in E.
https://issues.dlang.org/show_bug.cgi?id=15335

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